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Physical & Chemical properties

Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2017-11-20 to 2017-12-20
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reference:
Composition 0
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling Point)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7220 (Boiling Point / Boiling Range)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
method according to Siwoloboff
Test material information:
Composition 1
Key result
Atm. press.:
101 325 Pa
Decomposition:
yes
Decomp. temp.:
283.2 °C

Reference test

Table 1. Checking of the apparatus

20 November 2017

Atmospheric pressure, kPa

(at the measuring)

Boiling point, °C

(at standard atmospheric pressure)

99.89

100.0

99.89

100.1

99.89

100.2

Mean:

100.1

The boiling point of water was determined to be 100.1 °C (373.2 K). Measured values were determined to be in the required range (literature value ± 0.5 °C).

 

Preliminary test

Table 2. Preliminary test results

Start temperature, °C

Heating rate, °C/min

Atmospheric pressure, kPa

(at the measuring)

Boiling point, °C
(at standard atmospheric pressure)

79

5

99.89

294.4

 

Main test

For the main study the metal block was heated to 274 °C. The capillaries containing the test item were placed into the apparatus and the temperature was raised at 0.5 °C/min heating rate until the boiling temperature was reached. Three tests were carried out.At the end of the measurements the color of the samples became brown.The boiling temperature was determined and the detected boiling point ofthe test itemwas 283.2 ± 7.86 °C (95 % confidence interval) i.e. 556.3 K.

Table 3. Determination of the boiling point

Atmospheric pressure, kPa

(at the measuring)

Boiling point, °C

(at standard atmospheric pressure)

99.89

283.9

99.89

279.7

99.89

285.9

Mean:

283.2

RSD (CV %):

1.1

Conf.int. (95 %)

7.86

 

At the end of the test the test item became brown in the capillary. Based on this observation, the relative large difference between the measured values and the displayed signal ‘bumping’ the 283.2 °C is considered to be a decomposition temperature.

Conclusions:
The test item decomposes at 283.2 °C (556.3 K).
Executive summary:

A study was conducted according to OECD test guideline 103, Regulation (EC) No 440/2008 method A.2 and EPA OPPTS 830.8220 to determine the boiling point of the test item using the principle according to Siwoloboff. A small amount of the test item was filled in a capillary tube and was heated in the electronically temperature controlled sample block. In a preliminary test a boiling point of 294.4 °C was observed. This value was introduced as expected boiling temperature for the main test. The sample was heated from 274 °C at rate 0.5 °C/minute. The sample was observed visually for any possible changes in appearance, consistency and colour. The phase transition from liquid to vapour was deduced by the continuous formation of steam bubbles leaving the inserted boiling capillary. This determination was done in triplicate. The atmospheric pressure was recorded. The boiling temperature was determined and the boiling point of the test item was determined to be 283.2 °C i.e. 556.3 K. At the end of the measurements bumping was observed and the color of the samples became brown in the capillary. Based on this result the 283.2 °C (556.3 K) is considered to be a decomposition temperature.

Description of key information

The test item decomposes at 283.2 °C (556.3 K).

Key value for chemical safety assessment

Additional information

A study was conducted according to OECD test guideline 103, Regulation (EC) No 440/2008 method A.2 and EPA OPPTS 830.8220 to determine the boiling point of the test item using the principle according to Siwoloboff. A small amount of the test item was filled in a capillary tube and was heated in the electronically temperature controlled sample block. In a preliminary test a boiling point of 294.4 °C was observed. This value was introduced as expected boiling temperature for the main test. The sample was heated from 274 °C at rate 0.5 °C/minute. The sample was observed visually for any possible changes in appearance, consistency and colour. The phase transition from liquid to vapour was deduced by the continuous formation of steam bubbles leaving the inserted boiling capillary. This determination was done in triplicate. The atmospheric pressure was recorded. The boiling temperature was determined and the boiling point of the test item was determined to be 283.2 °C i.e. 556.3 K. At the end of the measurements bumping was observed and the color of the samples became brown in the capillary. Based on this result the 283.2 °C (556.3 K) is considered to be a decomposition temperature.